Abstract

A technique for forming Au/SiO₂ core/shell nanoparticles is developed. A long-wavelength shift of the extinction spectrum peak from 520 nm to 538 nm with increasing SiO₂ shell thickness from a monolayer to 10 nm is established. It is experimentally shown that the anomalous spectral shift of the extinction spectrum peak of Au/SiO₂ nanoparticle arrays from 538 nm to 720 nm, observed with increasing the SiO₂ shell thickness, is caused by the formation of Au nanoparticle di- and trimers within one SiO₂ shell. This effect is theoretically explained for the case of Au nanoparticle dimers.

中文翻译：

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Au / SiO 2核/壳纳米颗粒形成的光谱学表征

摘要

开发了形成Au / SiO ₂核/壳纳米粒子的技术。随着SiO ₂壳厚度从单层增加到10 nm ，消光光谱峰从520 nm到538 nm发生了长波漂移。实验表明，随着SiO ₂壳厚度的增加，观察到Au / SiO ₂纳米颗粒阵列的消光光谱峰从538 nm到720 nm的异常光谱移位是由于内部形成了Au纳米颗粒的二聚体和三聚体引起的。 1个SiO ₂壳。对于金纳米颗粒二聚体的情况，从理论上解释了这种效果。